Chair frame structure



FIG. 1 is a perspective view of chair frame structure showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left end view thereof;

FIG. 5 is a right end view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view showing the use and arrangement of my new design.

The surface(s) or portion(s) of the article shown in broken lines in the drawings being for illustrative purpose only and forming no part of the claimed design. 

CLAIM The ornamental design for a chair frame structure, as shown and described. 